EP1046320A1 - Electric heating device - Google Patents

Electric heating device

Info

Publication number
EP1046320A1
EP1046320A1 EP99904029A EP99904029A EP1046320A1 EP 1046320 A1 EP1046320 A1 EP 1046320A1 EP 99904029 A EP99904029 A EP 99904029A EP 99904029 A EP99904029 A EP 99904029A EP 1046320 A1 EP1046320 A1 EP 1046320A1
Authority
EP
European Patent Office
Prior art keywords
heating device
layer
electric heating
resistor ribbon
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99904029A
Other languages
German (de)
English (en)
French (fr)
Inventor
Irina Loktev
Igor Papirov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ceramitech Inc
Original Assignee
Ceramitech Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ceramitech Inc filed Critical Ceramitech Inc
Publication of EP1046320A1 publication Critical patent/EP1046320A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables
    • H05B3/565—Heating cables flat cables
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/013—Heaters using resistive films or coatings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/026—Heaters specially adapted for floor heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/033—Heater including particular mechanical reinforcing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

Definitions

  • the present invention generally relates to the area of electric heating elements. More
  • the present invention relates to electric heating elements for use in heating
  • the thin metal coating can be made of several materials
  • vapor-phase deposition method can be formed by chemical processes including the following: vapor-phase deposition method,
  • the heating element is based on a silver-palladium alloy (AgPd) or a
  • the cover layer has a
  • the heating element is 270 mm long by 15-
  • the coatings are also made from expensive metals.
  • the heaters thus have
  • Another known type of heating device is based on a heating element made of metal foil
  • the etching method is applicable only in manufacturing heating elements of limited
  • Heaters utilizing such elements are applicable, on the whole, in localized heating in
  • the metal remains brittle and easily destructible, limiting the life-span ofthe
  • Another known type of heater utilizes a foil made of a highly conductive material
  • the thickness ofthe foil is smaller (microns), and the foil is short
  • the latter patent proposes a technology for strengthening a heating element
  • the present invention aims to allow the manufacture of more versatile two-
  • An electric heating device in accordance with the present invention comprises a resistor
  • the ribbon is naturally flexible.
  • the flexible resistor ribbon has a high specific impedance. Also, where the
  • each ofthe sections ofthe electroconductive coating are at
  • the electroconductive coating ofthe spaced coating sections is generally the only layer of
  • the specific impedance ofthe resistor ribbon preferably adheres to the following formula
  • Rl is the specific impedance ofthe flexible resistor ribbon and R2 is a specific
  • the heating device has a rated operational current I e ⁇ ement and the electroconductive
  • coating has a maximum admissible current I max , a ratio between the rated operational current
  • the heating device further comprises
  • a substrate for example, a flat base to which the flexible resistor ribbon is attached.
  • the base may be rigid or flexible and made of any of a variety of fire-resistant or fireproof
  • materials including, without limitation, linoleum, PVC, plastic, fiberglass, or ceramic tile.
  • the heating device is suitable for incorporation into a building as a floor, wall or ceiling
  • a strip of two-sided adhesive tape may be attached to the layers of electric
  • a plate is connected to the base parallel
  • the flexible resistor ribbon is mounted on a back side ofthe plate between the plate and
  • the heating device in that case also comprises layers of electric insulation attached to
  • the flexible resistor ribbon being disposed between the base and the layers of electric
  • the flexible resistor ribbon is mounted on the
  • a supplemental layer of insulation may be
  • metal casing may incorporate connectors for operably connecting the metal casing to a power
  • the metal casing and the connector means may comprise a seamless
  • metal casing incorporates a heat radiator, the metal casing and the heat
  • radiator comprise a seamless integral body.
  • the base includes
  • the flexible electric insulation layers are selected from the
  • the device further comprises
  • the hose is preferably made of thermo-shrink plastic foil and is
  • the device utilizes a base having a sandwich assembly connected thereto.
  • the sandwich assembly
  • the sandwich assembly having a back side opposite the base.
  • a thin electroconductive layer is applied to side edges ofthe
  • the base with the sandwich assembly attached thereto may be manufactured by mounting
  • the first layer of electric insulation to one side ofthe base, attaching the resistor ribbon to the first
  • the waterproof layer is part of the sandwich
  • the thin electroconductive layer is applied onto the surface ofthe waterproof layer.
  • the method of manufacture may further comprise the steps of applying a thick layer of a
  • the thin electroconductive layer is applied also to the sculpted layer
  • seamless metal casing incorporates the connector box.
  • the metal casing is
  • the resistor ribbon being provided with spaced
  • resistor ribbon includes bending the sections ofthe coating at the bend points.
  • a method of heating a building structure comprises, in accordance with the present
  • the method may include mounting
  • the panel may be
  • An electric heating device comprises, in accordance with the present invention, a flexible
  • resistor ribbon having high electrical impedance and including a first face mounted onto an
  • insulated material and a second face mounted onto a substrate for direct heating thereof.
  • substrate may be ceramic, flexible or rigid plastic, leather or fabric.
  • ribbon may be wrapped around the substrate, woven into the substrate, molded into the substrate,
  • a heating device in accordance with the present invention facilitates the manufacture of
  • heating device permits the production of heaters of practically unlimited shapes and sizes. Life- span is increased over conventional heating devices incorporating resistor ribbons.
  • present invention can be made of less expensive materials, for example, foil made from
  • Heating devices in accordance with the invention may be manufactured easily via
  • the heating devices are versatile, reliable and cost-efficient.
  • Heating devices incorporating, in accordance with the present invention, a resistive
  • casing feature enhanced mechanical strength, fire and water resistance.
  • Fig. 1 is a schematic top plan view of an electric heating ribbon made from metallic foil
  • Fig. 2 is a schematic top plan view of an electric heating device having a rigid ceramic
  • Fig. 3 is a schematic cross-sectional view taken along line III-III in Fig. 2.
  • Fig. 4 is a schematic perspective view of an electric heating device mounted into a plastic shell, in accordance with the present invention.
  • Fig. 5 is a transverse cross-sectional view ofthe heating device and plastic shell of Fig. 4,
  • Fig. 6 is a schematic top plan view of a heating device with a tubular casing in
  • Fig. 7 is a schematic cross-sectional view similar to Fig. 3, showing an electric heating
  • Fig. 8 is a schematic cross-sectional view similar to Fig. 7, showing a modification ofthe
  • Fig. 9 is a schematic cross-sectional view similar to Figs. 3 and 7, showing an electric
  • heating device with a rigid ceramic base and a seamless metal casing incorporating a power cable
  • Fig. 10 is a schematic perspective view ofthe electric heating device of Fig. 9, modified
  • Fig. 11 is a schematic cross-sectional view similar to Figs. 3, 7, 8, and 9, showing an
  • electroconductive layer for electroplating in accordance with the present invention.
  • Fig. 12 is a schematic perspective view of a heating device in the form of a pipe provided
  • Fig. 13 is schematic perspective view of another heating device in the form of a pipe
  • Fig. 1 illustrates an elongate electric heating element 20 includes a flexible resistor ribbon 21 made from thin metallic resistor foil. This flexible resistor ribbon 21 is provided with
  • Such coating sections 22 are located at points where ribbon 21 is to be bent or folded
  • Coating sections 22 allow a bending or folding of heating element 20 without breaking
  • sections 22 perform two functions simultaneously. On the one hand, sections 22 reinforce
  • coating sections 22 shunt the flow of electric current through overlapping layers of resistor
  • ribbon 21 is covered with a thin layer of non-conductive oxides or with insulation, which is a
  • Electroconductive coating sections 22 as well as the very thin principal coating of
  • electroconductive material (not separately illustrated), can be made of several different metals,
  • the coating sections 22 can be formed by
  • Each electroconductive coating section 22 has a length L which equals or exceeds the
  • the specific impedance ofthe electroconductive coating of sections 22 is substantially lower than the specific
  • resistor ribbon 21 has a specific electric impedance Rl and coating sections 22 have a specific
  • Ieiement/Imax cover is less than Vi, where Ieiement is the rated current ofthe heating element 20 and
  • Imax cover is the maximum permitted electric current of the coating sections 22.
  • Heating element 20 is a core component of a number of household heating devices
  • the panel includes a rigid flat base 23 made, for instance, of a ceramic
  • heating element 20 fall exactly within the sections 22 of electroconductive coating.
  • base 23 may be made alternatively of a flexible material such as
  • the material of base 23 is fire-resistant or fireproof.
  • heating element 20 may be fastened to electric insulation layer 25
  • each strip or tape 26 is disposed
  • tapes 26 are made of thermo-resistant materials including thermo-resistant glue .and serve to
  • heating element 20 has terminals 27a and 27b which are
  • Terminals 27a and 27b are operatively or conductively connected to ribbon 21 at respective coating sections 22a and 22b.
  • electroconductive coating sections 22 may be sufficiently long to permit the
  • heating element 20 into a snaking configuration as shown in Fig. 2.
  • Hard plastic can also be used for making the base 23, the polymeric material acting as
  • heating device heating element 20 is sandwiched between separate layers ofthe plastic or
  • insulation layers 24 and 25 are also made
  • FIGs. 4 and 5 depict another embodiment of a heating device which incorporates a heating
  • element 30 in the form of a resistor ribbon 31 with spaced sections of electroconductive coating.
  • heating element 30 is attached to a rigid base 33 built from profiled
  • plastic for example, in the form of a plastic box of rectangular cross-section, joined together to
  • Heating element 31 is mounted on a back side of a front plate 32 of box-
  • Plate 32 thus serves as a heat radiating surface, and is covered on its back side
  • the heating device of Figs. 4 and 5 is assembled in such a
  • box-shaped base 33 can be left empty (as an air bubble), or alternatively, filled with a layer of
  • thermal insulation material 36 In the former case, air vents (not shown) can be provided in the
  • This embodiment ofthe heating device with an air bubble in the back ofthe shell or box-shaped base 33 can be used for wall
  • thermal insulation layer 36 is
  • the electrical heating device is suitable for building into floor or wall panels.
  • heating devices can be installed under all kinds of fixed surfaces inside a house, as well as under
  • a base or support for heating element 20 or 30 can assume any kind of three-dimensional
  • the base or support can also be flexible, with the heating element 20 or 30 squeezed
  • Heating element 20 may be incorporated into other kinds of heating devices, for example,
  • a resistive heating element 40 similar or
  • heating element 20 identical to heating element 20 is sandwiched between two electric insulation layers 44 and 45.
  • the resulting multi-layered assembly is then fitted into a flexible hose 47, made of waterproof
  • thermo-shrink plastic which is thermo-shrink plastic
  • hose 47 has special markings 48, indicating the locations of spaced sections of electroconductive
  • Heating element 40 can be bent or folded only at those portions thereof
  • Extra tensile strength and protection against accidental damage may be provided by an
  • thermo-shrink plastic hose 47 optional layer of extra-strong, bullet-proof material 49 under the thermo-shrink plastic hose 47.
  • Fig. 7 illustrates an electric heating device based on the above-described heating
  • a base 53 made of a ceramic tile, a flexible or rigid plastic or other fire-
  • a heating element 50 comprising a resistive ribbon 51 provided
  • the base 53 serves to provide structural reinforcement for the entire assembly as well as
  • the heating device To reduce heat flow from the back side ofthe heating device of Fig. 7, the heating device
  • Fig. 9 shows another electric heating device comprising a ceramic or polymeric base 63
  • Sandwich assembly 62 includes a
  • heating element 60 comprises a folded resistive ribbon 61 provided at spaced
  • a metal casing 66 is attached to a rear side of sandwich assembly 62, as well
  • Casing 66 is formed with an integral
  • the electric heating device of Fig. 9 may be modified so that
  • metal casing 66 is provided with an integral metal radiator 72 designed to enhance the
  • Fig. 11 illustrates an electric heating device similar to the device of Figs. 3, 7, 8, and 9 and additionally illustrates a method of manufacturing an electric heating device in the form of a
  • the heating device of Fig. 11 comprises a rigid base 73 made of a ceramic or
  • a heating element 70 comprising a resistive ribbon 71 provided with spaced
  • a seamless metal casing 76 is firmly secured to the second insulation layer 75 and side
  • Casing 76 is applied to the assembly by electroplating
  • a thin electroconductive layer 77 is applied to side edges of rigid
  • electroconductive layer 77 is lowered into an electroplating bath and connected to a cathode
  • casing 76 is formed as a galvanized metal layer firmly attached to base 73. Owing to the
  • the entire multi-layer assembly including the rigid base.
  • connector box 67 (Fig. 9) into the respective seamless metal casing 66.
  • copper terminals 69, power cable 68, and a sealing wall or partition 82 together are
  • insulation layer 65 are then covered with a layer of electroconductive coating (e.g., 77) and
  • composition such as water includes an elongate heating element 80 partially wrapped in a
  • heating element 80 can be woven, molded to, or glued to substrate or base 83.
  • Heating element 80 comprises a resistor ribbon 81 provided at spaced intervals with sections 84
  • Fig. 13 illustrates another heating device for modifying the temperature of a flowable
  • Heating element 90 is attached by molding, weaving, or gluing to a cylindrical
  • insulation materials such as polymer film or rubber sheeting.
  • Bases or substrates 23, 33, 53, 63, 73, 83 and 93 mechanically reinforce and improve the
  • thermal insulation material is sandwiched between outer insulation layer 55 and metal casing 56,
  • Resistive ribbons 21, 31, 51, 61, 71, 81, and 91 may be made of any number of alloys,
  • alloys has the following component elements with the relative weights listed in percentage of
  • the chromium content and the aluminum content are related to one another by the
  • the silicon content may be raised to 1.2%. Further increase in silicon content reduces potential
  • the base to which the resistive heating element 20 is attached may be any material
  • heating element 20 as well as terminals 27a and 27b (Fig. 2) and a
  • busbar portion of cable 28, 69 may be attached, in a first step of a manufacturing process, to a
  • the mesh insert may be
  • the insert may be
  • double-sided adhesive strips 26 need not
  • the strips may extend at an acute angle relative to the long main segments of snaking
  • the multiple strips 26 may themselves be segments of a single continuous

Landscapes

  • Surface Heating Bodies (AREA)
  • Resistance Heating (AREA)
  • Central Heating Systems (AREA)
EP99904029A 1998-01-09 1999-01-06 Electric heating device Withdrawn EP1046320A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US7089098P 1998-01-09 1998-01-09
US70890P 1998-01-09
PCT/US1999/000209 WO1999035888A1 (en) 1998-01-09 1999-01-06 Electric heating device

Publications (1)

Publication Number Publication Date
EP1046320A1 true EP1046320A1 (en) 2000-10-25

Family

ID=22097982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99904029A Withdrawn EP1046320A1 (en) 1998-01-09 1999-01-06 Electric heating device

Country Status (7)

Country Link
US (1) US6353707B1 (xx)
EP (1) EP1046320A1 (xx)
JP (1) JP2002501292A (xx)
AU (1) AU2451799A (xx)
CA (1) CA2317566A1 (xx)
IL (1) IL137191A0 (xx)
WO (1) WO1999035888A1 (xx)

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AU2451799A (en) 1999-07-26
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CA2317566A1 (en) 1999-07-15
WO1999035888A1 (en) 1999-07-15
US6353707B1 (en) 2002-03-05

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